XXV 



Sir William Thomson: On contact Electricity. 



Prof, Ayrton and Perry: Contact Theory of Voltale Action. 



Captain Abney: Photometric Measurements of the Magneto-Electrie 

 Light. 



W. Fronde: Mechanical Theory of the Soaring of Birds. 



Lord Rayleigh: Oa the Forces Experi enced by a Lamina immersed 

 Obliquely in a Fluid Stream. 



W. Crookes: On the influence of the Residuai Gas on the Movement 

 of the Radiometer. 



G. H. Gimingham: On a Modification of the Sprengel Pump, and a 

 new Form of Vacuum Tap. 



J. Glaisher: Report of the Luminous Meteor Coramittee. 



Dott. Joule: Report of the Committee for Deterraining the Dynamical 

 Equivalent of Heat. 



Prof. J. Dewar: On a New form of Electrometer. 



Dott. Jules Janssen of Paris; On Solar Photography with Reference 

 to the History of the Solar Surface. 



Dott. Jules Janssen: On the Eclipse of the Sun Observed at Siam 

 in Aprii 1875. 



Howard Grubb: On a Method of Photographing the Defects in Opti- 

 cal Glass arising from waut of Homogeneity. 



Howard Grubb: On the Testing of Large Telescopio Objectives. 



Howard Grubb: On Recent improvements in Equatorial Telescopes. 



G. Chrystal and. S. A. Saunder: Coniparison of the B. A. Unita. 



W. Ladd: A Description of Spottiswoode' s Pocket Polarizing Appa- 

 ratus. 



Prof. Henne ssy: On New Standards of Measure and Weight. 



C. Meldrum: On the Cyclones of the Indian Ocean. 



Prof. Barrett: On a Form of Gasholder giving a Uniform Flow 

 of Gas. 



Prof. Barrett: Diagrams and Description of the new Lecture Table 

 for Physical Demonstration in the Royal College of Science for Ireland. 



Prof. Barrett: Preliminary Report of the Committoe on the Magne- 

 tization of Iron, Nickel, and Cobalt. 



Sir William Thomson: Eifects of Stress on the Magnetization of Iron. 



G. T. Bottoraley: Deterraination of the Couductivity of Heat and 

 Water. 



Sir William Thomson: Secular lllustration of the Laws of the Dif- 

 fusion of Liquids. 



Prof. Barrett: Two New Forms of Apparatus for the Experimental 

 lllustration of the Expansion of Solids by Heat. 



